function openLoading() {
    var elementById = top.document.getElementById("div_loading");
    if (elementById !== null) {
        elementById.style.display = "block";
    }
}

function closeLoading() {
    var elementById = top.document.getElementById("div_loading");
    if (elementById !== null) {
        elementById.style.display = "none";
    } else {
        console.info("null");
    }
}
